Abstract
The monoclonal anti-DNA autoantibody A52 (IgG2b) was obtained from a (NZB X NZW)F1 (B/W) hybridoma. Two rabbits were immunized with the pure monoclonal antibody and produced anti-idiotypic (Id) antibodies. The purified anti-Id reacted with three different B/W monoclonal anti-DNA antibodies at or close to their DNA binding sites. Moreover, the rabbit antibodies had a profound inhibitory effect on the polyclonal anti-DNA activity in the majority of sera derived from B/W mice and human systemic lupus erythematosus (SLE) patients. The A52 IgG must, therefore, represent a major cross-reactive Id of anti-DNA immunoglobulins. In addition, the rabbit anti-Id antibodies may act as the "internal image" of antigen and should prove useful in modulation of the autoimmune response to DNA in SLE.
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